fontconfig libX11 mesa pixman git update 10 dec 2012

libX11 9833489e6c3829a1e835bc0a11f028fc180809e4
mesa 17f5dc57306b8f5079304701e455bf4b927d3cae
pixman 8ca4e144724ba2041bc5ef077ccf6d24e7cf4d1f
fontconfig 608c5b590bd3428dfcd30f3d68ee8b7131e2f019

1 files changed, 238 insertions, 0 deletions

diff --git a/pixman/test/utils-prng.c b/pixman/test/utils-prng.c
new file mode 100644
index 000000000..7c2dd6a9a
--- /dev/null
+++ b/pixman/test/utils-prng.c
@@ -0,0 +1,238 @@
+/*
+ * Copyright © 2012 Siarhei Siamashka <siarhei.siamashka@gmail.com>
+ *
+ * Based on the public domain implementation of small noncryptographic PRNG
+ * authored by Bob Jenkins: http://burtleburtle.net/bob/rand/smallprng.html
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include "utils.h"
+#include "utils-prng.h"
+
+void smallprng_srand_r (smallprng_t *x, uint32_t seed)
+{
+    uint32_t i;
+    x->a = 0xf1ea5eed, x->b = x->c = x->d = seed;
+    for (i = 0; i < 20; ++i)
+        smallprng_rand_r (x);
+}
+
+/*
+ * Set a 32-bit seed for PRNG
+ *
+ * LCG is used here for generating independent seeds for different
+ * smallprng instances (in the case if smallprng is also used for
+ * generating these seeds, "Big Crush" test from TestU01 detects
+ * some problems in the glued 'prng_rand_128_r' output data).
+ * Actually we might be even better using some cryptographic
+ * hash for this purpose, but LCG seems to be also enough for
+ * passing "Big Crush".
+ */
+void prng_srand_r (prng_t *x, uint32_t seed)
+{
+#ifdef GCC_VECTOR_EXTENSIONS_SUPPORTED
+    int i;
+    prng_rand_128_data_t dummy;
+    smallprng_srand_r (&x->p0, seed);
+    x->a[0] = x->a[1] = x->a[2] = x->a[3] = 0xf1ea5eed;
+    x->b[0] = x->c[0] = x->d[0] = (seed = seed * 1103515245 + 12345);
+    x->b[1] = x->c[1] = x->d[1] = (seed = seed * 1103515245 + 12345);
+    x->b[2] = x->c[2] = x->d[2] = (seed = seed * 1103515245 + 12345);
+    x->b[3] = x->c[3] = x->d[3] = (seed = seed * 1103515245 + 12345);
+    for (i = 0; i < 20; ++i)
+        prng_rand_128_r (x, &dummy);
+#else
+    smallprng_srand_r (&x->p0, seed);
+    smallprng_srand_r (&x->p1, (seed = seed * 1103515245 + 12345));
+    smallprng_srand_r (&x->p2, (seed = seed * 1103515245 + 12345));
+    smallprng_srand_r (&x->p3, (seed = seed * 1103515245 + 12345));
+    smallprng_srand_r (&x->p4, (seed = seed * 1103515245 + 12345));
+#endif
+}
+
+static force_inline void
+store_rand_128_data (void *addr, prng_rand_128_data_t *d, int aligned)
+{
+#ifdef GCC_VECTOR_EXTENSIONS_SUPPORTED
+    if (aligned)
+    {
+        *(uint8x16 *)addr = d->vb;
+        return;
+    }
+#endif
+    /* we could try something better for unaligned writes (packed attribute),
+     * but GCC is not very reliable: http://gcc.gnu.org/PR55454 */
+    memcpy (addr, d, 16);
+}
+
+/*
+ * Helper function and the actual code for "prng_randmemset_r" function
+ */
+static force_inline void
+randmemset_internal (prng_t                  *prng,
+                     uint8_t                 *buf,
+                     size_t                   size,
+                     prng_randmemset_flags_t  flags,
+                     int                      aligned)
+{
+    prng_t local_prng = *prng;
+    prng_rand_128_data_t randdata;
+
+    while (size >= 16)
+    {
+        prng_rand_128_data_t t;
+        if (flags == 0)
+        {
+            prng_rand_128_r (&local_prng, &randdata);
+        }
+        else
+        {
+            prng_rand_128_r (&local_prng, &t);
+            prng_rand_128_r (&local_prng, &randdata);
+#ifdef GCC_VECTOR_EXTENSIONS_SUPPORTED
+            if (flags & RANDMEMSET_MORE_FF)
+            {
+                const uint8x16 const_C0 =
+                {
+                    0xC0, 0xC0, 0xC0, 0xC0, 0xC0, 0xC0, 0xC0, 0xC0,
+                    0xC0, 0xC0, 0xC0, 0xC0, 0xC0, 0xC0, 0xC0, 0xC0
+                };
+                randdata.vb |= (t.vb >= const_C0);
+            }
+            if (flags & RANDMEMSET_MORE_00)
+            {
+                const uint8x16 const_40 =
+                {
+                    0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,
+                    0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40
+                };
+                randdata.vb &= (t.vb >= const_40);
+            }
+#else
+            #define PROCESS_ONE_LANE(i)                                       \
+                if (flags & RANDMEMSET_MORE_FF)                               \
+                {                                                             \
+                    uint32_t mask_ff = (t.w[i] & (t.w[i] << 1)) & 0x80808080; \
+                    mask_ff |= mask_ff >> 1;                                  \
+                    mask_ff |= mask_ff >> 2;                                  \
+                    mask_ff |= mask_ff >> 4;                                  \
+                    randdata.w[i] |= mask_ff;                                 \
+                }                                                             \
+                if (flags & RANDMEMSET_MORE_00)                               \
+                {                                                             \
+                    uint32_t mask_00 = (t.w[i] | (t.w[i] << 1)) & 0x80808080; \
+                    mask_00 |= mask_00 >> 1;                                  \
+                    mask_00 |= mask_00 >> 2;                                  \
+                    mask_00 |= mask_00 >> 4;                                  \
+                    randdata.w[i] &= mask_00;                                 \
+                }
+
+            PROCESS_ONE_LANE (0)
+            PROCESS_ONE_LANE (1)
+            PROCESS_ONE_LANE (2)
+            PROCESS_ONE_LANE (3)
+#endif
+        }
+        if (is_little_endian ())
+        {
+            store_rand_128_data (buf, &randdata, aligned);
+            buf += 16;
+        }
+        else
+        {
+#ifdef GCC_VECTOR_EXTENSIONS_SUPPORTED
+            const uint8x16 bswap_shufflemask =
+            {
+                3, 2, 1, 0, 7, 6, 5, 4, 11, 10, 9, 8, 15, 14, 13, 12
+            };
+            randdata.vb = __builtin_shuffle (randdata.vb, bswap_shufflemask);
+            store_rand_128_data (buf, &randdata, aligned);
+            buf += 16;
+#else
+            uint8_t t1, t2, t3, t4;
+            #define STORE_ONE_LANE(i)                                         \
+                t1 = randdata.b[i * 4 + 3];                                   \
+                t2 = randdata.b[i * 4 + 2];                                   \
+                t3 = randdata.b[i * 4 + 1];                                   \
+                t4 = randdata.b[i * 4 + 0];                                   \
+                *buf++ = t1;                                                  \
+                *buf++ = t2;                                                  \
+                *buf++ = t3;                                                  \
+                *buf++ = t4;
+
+            STORE_ONE_LANE (0)
+            STORE_ONE_LANE (1)
+            STORE_ONE_LANE (2)
+            STORE_ONE_LANE (3)
+#endif
+        }
+        size -= 16;
+    }
+    while (size > 0)
+    {
+        uint8_t randbyte = prng_rand_r (&local_prng) & 0xFF;
+        if (flags != 0)
+        {
+            uint8_t t = prng_rand_r (&local_prng) & 0xFF;
+            if ((flags & RANDMEMSET_MORE_FF) && (t >= 0xC0))
+                randbyte = 0xFF;
+            if ((flags & RANDMEMSET_MORE_00) && (t < 0x40))
+                randbyte = 0x00;
+        }
+        *buf++ = randbyte;
+        size--;
+    }
+    *prng = local_prng;
+}
+
+/*
+ * Fill memory buffer with random data. Flags argument may be used
+ * to tweak some statistics properties:
+ *    RANDMEMSET_MORE_00 - set ~25% of bytes to 0x00
+ *    RANDMEMSET_MORE_FF - set ~25% of bytes to 0xFF
+ */
+void prng_randmemset_r (prng_t                  *prng,
+                        void                    *voidbuf,
+                        size_t                   size,
+                        prng_randmemset_flags_t  flags)
+{
+    uint8_t *buf = (uint8_t *)voidbuf;
+    if ((uintptr_t)buf & 15)
+    {
+        /* unaligned buffer */
+        if (flags == 0)
+            randmemset_internal (prng, buf, size, 0, 0);
+        else if (flags == RANDMEMSET_MORE_00_AND_FF)
+            randmemset_internal (prng, buf, size, RANDMEMSET_MORE_00_AND_FF, 0);
+        else
+            randmemset_internal (prng, buf, size, flags, 0);
+    }
+    else
+    {
+        /* aligned buffer */
+        if (flags == 0)
+            randmemset_internal (prng, buf, size, 0, 1);
+        else if (flags == RANDMEMSET_MORE_00_AND_FF)
+            randmemset_internal (prng, buf, size, RANDMEMSET_MORE_00_AND_FF, 1);
+        else
+            randmemset_internal (prng, buf, size, flags, 1);
+    }
+}